Comparison of Detection of Escherichia coli O157 Between Culture After Acid Treatment and Polymerase Chain Reaction After Enrichment / 대한진단검사의학회지
The Korean Journal of Laboratory Medicine
;
: 331-335, 2002.
Artículo
en Coreano
| WPRIM
| ID: wpr-221288
ABSTRACT
BACKGROUND:
The Polymerase Chain Reaction (PCR) for the Shiga toxin has been widely used for diagnosis of Shiga toxin-producing Escherichia coli (STEC) infection including Escherichia coli O157 (O157) instead of using a culture. However, bacteriological isolation must be followed for final diagnosis. Our study was aimed to compare the detection limit between the culture after the acid treatment and the PCR after enrichment.METHODS:
The standard strain of O157 was cultured, diluted and mixed with the stool of normal adult in order to make a final concentration of the 10(1)-10(5) colony forming unit (CFU)/g of stool. Each concentration of samples was enriched in a trypticase soy broth for 6 hours at 42degrees C and treated with acid to suppress normal flora. Then it was streaked on cefixime-tellurite-sorbitol MacConkey (CT-SMAC) agar evenly and cultured for 18 hours at 37degrees C. The same concentrations of bacterial suspension in the stool were enriched in a Luria-Bertani (LB) broth overnight at 37degrees C. The centrifuged pellets from 1 mL of each concentration of the samples were boiled and DNA was extracted using the resin method and PCR was performed to amplify stx2.RESULTS:
The detection limit for the culture after acid treatment was 10(3) CFU/g of the stool and that for PCR after enrichment was 101 CFU/g of the stool.CONCLUSIONS:
Culture after acid treatment for O157 would be an effective method for isolation of O157 from a patient's stool. However, this method is less sensitive than the PCR after enrichment as far as detection limit is concerned. A combination of both methods would be an effective method for detecting O157 from patient stools.
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Células Madre
/
ADN
/
Reacción en Cadena de la Polimerasa
/
Escherichia coli O157
/
Toxina Shiga
/
Agar
/
Diagnóstico
/
Escherichia
/
Escherichia coli
/
Escherichia coli Shiga-Toxigénica
Tipo de estudio:
Estudio diagnóstico
Límite:
Adulto
/
Humanos
Idioma:
Coreano
Revista:
The Korean Journal of Laboratory Medicine
Año:
2002
Tipo del documento:
Artículo
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